diff --git a/crates/ruff_python_formatter/src/module/mod_module.rs b/crates/ruff_python_formatter/src/module/mod_module.rs
index fe21ed65fa..0d0fee7c00 100644
--- a/crates/ruff_python_formatter/src/module/mod_module.rs
+++ b/crates/ruff_python_formatter/src/module/mod_module.rs
@@ -9,10 +9,17 @@ pub struct FormatModModule;
 
 impl FormatNodeRule<ModModule> for FormatModModule {
     fn fmt_fields(&self, item: &ModModule, f: &mut PyFormatter) -> FormatResult<()> {
+        let ModModule {
+            range: _,
+            body,
+            type_ignores,
+        } = item;
+        // https://docs.python.org/3/library/ast.html#ast-helpers
+        debug_assert!(type_ignores.is_empty());
         write!(
             f,
             [
-                item.body.format().with_options(SuiteLevel::TopLevel),
+                body.format().with_options(SuiteLevel::TopLevel),
                 // Trailing newline at the end of the file
                 hard_line_break()
             ]